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// Copyright 2018-present the CoreDHCP Authors. All rights reserved
// This source code is licensed under the MIT license found in the
// LICENSE file in the root directory of this source tree.
package sleep
// This plugin introduces a delay in the DHCP response.
import (
"fmt"
"time"
"github.com/coredhcp/coredhcp/handler"
"github.com/coredhcp/coredhcp/logger"
"github.com/coredhcp/coredhcp/plugins"
"github.com/insomniacslk/dhcp/dhcpv4"
"github.com/insomniacslk/dhcp/dhcpv6"
)
var (
pluginName = "sleep"
log = logger.GetLogger("plugins/" + pluginName)
)
// Example configuration of the `sleep` plugin:
//
// server4:
// plugins:
// - sleep 300ms
// - file: "leases4.txt"
//
// server6:
// plugins:
// - sleep 1s
// - file: "leases6.txt"
//
// For the duration format, see the documentation of `time.ParseDuration`,
// https://golang.org/pkg/time/#ParseDuration .
// Plugin contains the `sleep` plugin data.
var Plugin = plugins.Plugin{
Name: pluginName,
Setup6: setup6,
Setup4: setup4,
}
func setup6(args ...string) (handler.Handler6, error) {
if len(args) != 1 {
return nil, fmt.Errorf("want exactly one argument, got %d", len(args))
}
delay, err := time.ParseDuration(args[0])
if err != nil {
return nil, fmt.Errorf("failed to parse duration: %w", err)
}
log.Printf("loaded plugin for DHCPv6.")
return makeSleepHandler6(delay), nil
}
func setup4(args ...string) (handler.Handler4, error) {
if len(args) != 1 {
return nil, fmt.Errorf("want exactly one argument, got %d", len(args))
}
delay, err := time.ParseDuration(args[0])
if err != nil {
return nil, fmt.Errorf("failed to parse duration: %w", err)
}
log.Printf("loaded plugin for DHCPv4.")
return makeSleepHandler4(delay), nil
}
func makeSleepHandler6(delay time.Duration) handler.Handler6 {
return func(req, resp dhcpv6.DHCPv6) (dhcpv6.DHCPv6, bool) {
log.Printf("introducing delay of %s in response", delay)
// return the unmodified response, and instruct coredhcp to continue to
// the next plugin.
time.Sleep(delay)
return resp, false
}
}
func makeSleepHandler4(delay time.Duration) handler.Handler4 {
return func(req, resp *dhcpv4.DHCPv4) (*dhcpv4.DHCPv4, bool) {
log.Printf("introducing delay of %s in response", delay)
// return the unmodified response, and instruct coredhcp to continue to
// the next plugin.
time.Sleep(delay)
return resp, false
}
}
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